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Table 2 Sequence and structural motifs in scallop (Air) and squid (Tpa) Gq-opsins

From: Structural differences and differential expression among rhabdomeric opsins reveal functional change after gene duplication in the bay scallop, Argopecten irradians (Pectinidae)

Motifs Air-OPNGq1 493 aa Air-OPNGq2 456 aa Air-OPNGq3 519 aa Air-OPNGq4 481 aa Tpa-OPNGq1 448 aa
LxxxD TMII (pos 76–80) LAVSD LALSD LALSD LALSD LAFSD
Disulfide bond C108, C186 C108, C186 C108, C186 C108, C186 C108, C186
Hydrogen bond with Schiff base N87, Y111 N87, Y111 N87, Y111 N87, Y111 N87, Y111
E/DRY TMIII (pos 132–134) DRY DRC DRF DRF DRY
Counterion E180 E180 E180 E180 E180
LAK TMVII (pos 305–307) LAK LAK LAK LAK FAK
NPxxY TMVII (pos 311–315) NPIIY NPIVY NPIVY NPLVY NPMIY
G-protein binding (pos 319–321) HPK HPK HPK HPR HPK
  1. The amino acid numbering system follows the amino acid position (pos) of squid rhodopsin